package com.websocket.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

/**
 * @author fg
 * @description 登录filter  
 * @date 2017年7月30日
 */
@WebFilter(filterName="loginFilter",urlPatterns="/*")
public class LoginFilter implements Filter {

	@Override
	public void init(FilterConfig filterConfig) throws ServletException {
		
	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
			throws IOException, ServletException {
		HttpServletRequest req = (HttpServletRequest) request;
		if(!"/loginServlet".equals(req.getServletPath())) {
			HttpSession sessoin = req.getSession();
			if(sessoin.getAttribute("user") == null) {
				request.getRequestDispatcher("login.jsp").forward(request, response);
				return;
			}
		}
		chain.doFilter(request, response);
		
	}

	@Override
	public void destroy() {
		
	}

}
